如图甲所示，粗糙长木板的一端固定在铰链上，木块放在木板上，开始木板处于水平位置。当木板向下转动，角逐渐增大的过程中，摩擦力Ff的大小随角变化最有可能的是图乙中的（ ）
Great changes have taken place in our city in the past ten years．Everything ______comes into sight is so new to me．（ ）
that
which
who
whom
He Jing______to give a speech at the graduation ceremony at Harvard University last month．（ ）
invites
invited
is invited
was invited
﹣It is reported that cancer can be controlled at a temperature lower than 100℃below zero．﹣Really？______ nice surprise!（ ）
How
What
What a
What an
Unless the weather______，we'll have to cancel the picnic．（ ）
improve
improves
improved
will improve
School violence______much attention of the whole society and people are calling on the government to make laws against it as early as possible．（ ）
drew
will draw
has drawn
was drawing
的
一端固定在铰链上，木块放在木板上，开始木板处于水平位置。当木板向下转动，
角逐渐增大的过程中，摩擦力Ff的大小随角变化最有可能的是图乙中的（ ）
的一端固定在铰链上，木块放在木板上，开始木板处于水平位置。当木板向下转动，角逐渐增大的过程中，摩擦力Ff的大小随角变化最有可能的是图乙中的（ ） 
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