— Me, too. We have to ____________ new ways to solve the problem.
A:come up with
B:keep up with
C:catch up with
D:help out with
同一纬线上各地正午太阳高度和昼夜长短相同。
汉译英。
①一些冰激凌____②四个汉堡包____
③两个西红柿____④七个草莓____
⑤一瓶橘汁____⑥听起来不错____
如图是一个以点A为对称中心的中心对称图形,若∠C =90°,∠B = 30°,AC = 1,则BB′的长为( )