Question

Ants are the most common life form on earth, ___________ tiny, their combined weight is greater than that of the combined weight of all humans.

A．though

B．although

C．even though

D．as if

Answer 1

A

考查连词：A. though虽然，可位于句首，句中，句末B. although虽然，只能在句首，C. even though即使，D. as if好像，句意：蚂蚁是地球上最常见的生命形式，虽然小，但它们团结的力量比人类团结的力量都大。选A。