According to the data in Figure 3, what effect, if any,did removing the herbaceous layer have on the percent distribution among the 1-year-old seedlings in the 1-hectare area of the forest? The removal of the herbaceous layer:

单项选择题Bill hit his car into a wall last night.

单项选择题John speaks French as fluently as he does German.

单项选择题It may be more of a suggestion than an invitation.

单项选择题In the standard (x,y) coordinate plane, what is the slope of a line that is perpendicular to 2x- 3y = 9 ?

单项选择题The length of a rectangle is 4 inches longer than the width. The perimeter of the rectangle is 28 inches.What is the width of the rectangle, in inches?

单项选择题James plans to __________ offers from other companies before making a decision.

单项选择题（）makes his shop different is that it offers more personal services.

A.What
B.Who
C.Whatever
D.Whoever

单项选择题99%of the time，we（）.

A.pay no attention to our gestures and body movements
B.are aware of our gestures and body movements
C.know what the meaning of other persons gestures and body movements
D.All of the above

单项选择题Doctor Reef lives a ___________ life

单项选择题Rather than ___ me, he simply got up early to wash the clothes himself