直翅目昆虫有何特点？
参考答案：
前翅为覆翅，后翅为膜翅；口器为咀嚼式，渐变态。
机动车在这种情况下可以超车（隧道内）。
—What _____ they _____ last weekend?
—They played computer games. [ ]
A. do; do
B. do; did
C. did; do
D. are; doing
