填空题

It is recommended that the project______(所有的准备工作结束之后再开始)．

【参考答案】

not be started until all the preparations have been made
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单项选择题
Mayer Hillman indicates that children now have less and less______.
A．space for playing
B．contact with animals
C．concern about others
D．knowledge about nature
单项选择题
It is discovered by Henry Amerson’s team that ______.
A．southern pines cannot resist fungus
B．all southern pines are not susceptible
C．the genetic marker in southern pines was the easiest to identify
D．fungus-resistant genes came originally from outside the U.S.A.
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