单项选择题

It is better for parents ______.

A．to praise and encourage their children more often
B．to be hard on their children
C．to leave their children alone with nothing to do
D．to give their children as much help as possible

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单项选择题

The author imply that ______.

A．The US's Monsanto agreed with the results of Chinese scientists study
B．GM cotton is an ideal crop
C．The US's Monsanto dismissed the research for its own profit
D．Cotton bollworm has no resistance to Bt cotton over time

单项选择题

The world yields (line 13) means ______.

A．plants
B．giving up
C．establishment
D．productions