Dinosaur scientists can probably know whether dinosaurs were good parents by __________ .

• A、watching many kinds of animals 

• B、studying dinosaurs' living relatives

• C、following the tracks left behind

• D、working on dug-out dinosaur eggs

58 （）

In the second paragraph, the term "in effect" means __________.

• A、in fact 

• B、it is doubtful 

• C、often 

• D、without reason