ners effective water supply management.
Correct order:
二、选句填空。将方格中的各个句子填入引言中合适的空格中。
a. However, they were unable to obtain stable solutions for sand transport and the quantitative predictions of concentration were far from satisfactory.
b. Most existing mathematical models for predicting sediment transport in sheet flow regime are based on the governing equations for single-phase flow[1-3].
c. The detailed computations are then carried out and the numerical predictions are compared with the experimental measurements.
d. It has been recognized that among all the transport modes the sheet flow condition is the most important due to the large transport rate involved.
e. None of these models were capable of predicting the peak values of the particle velocity profiles and providing as much insight into the fluid-particle interactions as would a complete two-phase modeling two-phase modeling approach.
f. The forcing terms such as the interaction force, the intergranular stresses and the turbulent stress were carefully formulated.
(1)______ Over the last two decades, considerable research efforts have been directed to the understanding and prediction of these flows. (2)_______ However, since the models of this-kind do not address the interaction between fluid and sediment in a fundamental way, the moving mechanism of the sediment in this high concentration region cannot be properly accounted for. Considering the fact that the intergranular stress and the interaction between fluid and sediment are dominant in the sheet flow regime, a natural and accurate approach is to treat the fluid and sediment as two-phase flow. Asano [4] and Ono et al. [5] are among those who proposed partial two-phased models in which the vertical velocity of particles was approximated by an empirical expression rather than solved in the same way as the horizontal velocity. (3)______ One of such models was developed by Li and Sawamoto[6]. They extended Asano's work and based their formulation on the complete set of linearized two-phase equations. (4)_______
In this paper a complete two-phase flow model is presented for the simulation of the sediment motions on a flat bed under unsteady flow conditions. (5) ______ In order to ensure the numerical stability, a mixed implicit and explicit finite difference scheme was developed to solve the nonlinear equations. (6)________
Answer:
(1) ________ (2)________ (3)________
(4) ________ (5)________ (6) ________
三、下面是一篇学术文章的引言，将括号中的动词变成合适的形式。
Introduction
The feeding habit of leopard frog (豹蛙) are poorly understood (Rittschof 1975 ). Past investigations (1)________ (indicate) that species feeds on a wide variety of prey (Knowlton 1944, Linzey 1967, Rittschof 1975 ). Rittschof (1975) (2)_______ (note) that the prey most commonly consumed (3)_________(be) slow moving individuals of the orders Coleoptera, Lepidoptera and Orthoptera, but he (4)_________ ( not determine ) if adult and young leopard frogs fed on significantly different types of prey. In Michigan populations, recently trans- formed juveniles ingested ants. These ants (5)__________ (never find ) in the stomachs of adult frogs (Rittschof 1975). Whether this (6)_________( reflect ) a true feeding preference by young frogs, or (7)__________ (be) simply a result of local prey availability, (8) __________ (be) unknown. Stomach content analyses (9)_________ (reveal) the presence of both diurnal and nocturnal prey suggesting that leopard frogs (10)_____________(feed) during both day and night (Hine et al. 1981, Rittschof 1975). The primary purpose of our investigation ( 11 )____________( be ) to document the prey consumption of adult and young leopard frogs from a restored wetland in northeastern Ohio. We note differences in the prey consumed by adult and juvenile frogs and (12)__________ (compare) the relative activity level of the prey types to determine if adult and young frogs specialize on active or inactive prey.
参考答案
一、根据引言的结构规律排列次序。
Correct order：3—l—4—2
二、选句填空。将方格中的各个句子填入引言中合适的空格中。
(1)d (2)b (3)e (4)a (5)f (6)c
三、下面是一篇学术文章的引言，将括号中的动词变成合适的形式。
(1) indicate (2) noted
(3) were (4) did not determine
(5) were never found (6) reflects
(7) is (8) is
(9) revealed (10) feed
( 11 ) is (12) compare

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