目前，我校国家助学贷款的发放实行的是一次申请、一次授信、一次发放的方式。()
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Why does the author mention "Indian mustard"？
A. To warn about possible risks involved in phytoremediation
B. To help illustrate the potential of phytoremediation
C. To show that hyperaccumulating plants grow in many regions of the world
D. To explain how zinc contamination can be reduced
It can be inferred from paragraph 6 that compared with standard practices for remediation
A. does not allow for the use of the removed minerals for industrial purposes
B. can be faster to implement
C. is equally friendly to the environment
D. is less suitable for soils that need to be used within a short period of time
减速器的传动比i=（)。A.>1;B.<1;C.=1。减速器的传动比i=（)。A.>1;B.<1;C.=1。
减速器的传动比i=()。
A. >1;
B. <1;
C. =1。
Which of the sentences below best expresses the essential information in the highlighted sentence in paragraph 6？ Incorrect choices change the meaning in important ways or leave out essential information.
A. Before considering phytoremediation, hyperaccumulating species of plants local to the target area must be identified.
B. The investigation begins with an evaluation of toxic sites in the target area to determine the extent of contamination.
C. The first step in phytoremediation is the planting of hyperaccumulating plants in the area to be cleaned up.
D. Mines and irrigation ponds can be kept from becoming contaminated by planting hyperaccumulating species in targeted areas.
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