What does the phrase search narrowly, used in line 5, mean ?
search narrowly the lines! -they hold a treasure
a to look scarcely
b to look closely
c to look with decreasing attention
d to look with increasing attetion

B. to look closely.

Explanation:

In this sentence, when the author tells us to "search narrowly the lines! They hold a treasure" what he means is that we need to look closely, or carefully in order to discover this treasure. "Narrowly" means carefully, or with close attention. If you do not know what a particular word means, and you do not have a dictionary at hand, sometimes context clues can provide you with the information you need to figure out the meaning of a word.

in other words

to put it differently

for one thing

as an illustration

in this case

for this reason

to put it another way

that is to say

with attention to

by all means

important to realize

another key point

first thing to remember

most compelling evidence

must be remembered

point often overlooked

to point out

on the positive side

on the negative side

with this in mind

notably

including

like

to be sure

namely

chiefly

truly

indeed

certainly

surely

markedly

such as

especially

explicitly

specifically

expressly

surprisingly

frequently

significantly

particularly

in fact

in general

in particular

in detail

for example

for instance

to demonstrate

to emphasize

to repeat

to clarify

to explain

to enumerate