Read the following passage and mark the letter A, B, C or D to indicate the correct answer to each of the questions

A. The growth rate of hardwoods.

B. The transportation difficulties

C. The number of useless trees

D. The high costs of commercial lumbering in the tropics.

A. there is little variety in the types of trees in the forests

B. selecting valuable trees is difficult

C. many of the trees are useless for timber

D. very few hardwoods grow in the forests

A. are easy to cut down

B. mature very slowly

C. are tropical species

D. are near to rivers

A. used to transport wood

B. floated up the rivers

C. moved away from clear areas

D. transported near the market

A. precious

B. important

C. major

D. useless